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If you have the wrench on the positive terminal when the negative is also attached, and it contacts metal on the chassis, it will short the battery direct to ground. On the other hand, if you touch the negative to ground while the positive cable is also connected, nothing will happen. So when disconnecting the battery for any reason, disconnect the NEGATIVE first (before the positive side), OR if you simply want the battery "taken off-line", simply remove the negative side.
Now if you are say installing a new battery, the opposite is true; CONNECT the positive first, THEN connect the negative. You never want to take a chance of working on the positive cable whenever the negative is connected, this is pretty dangerous. The power we're talking about here, even with a fairly lousy battery, can make a wrench glow red-hot in seconds, big sparks too.
On a 107 like this, even those metal straps that hold down the battery box lid can short out the wrench.
Gilly
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